That's a reversal from last week, when city officials denied the group permission to fly the "Trump Baby" blimp over Parliament Square.
Trump's postprandial departure will be accompanied by the Royal Regiment of Scotland playing the bagpipes, a tip of the hat perhaps to Trump's Scottish-German heritage.
The diaper-clad "Trump Baby" stands almost 20 feet high, sports the president's signature blond hair, and holds a cellphone in his very small hands.
However, Damien Smyth, the landlord of the Jameson pub in Hammersmith, west London, will host a welcome party - where guests will be treated to a barbecue and Trump-themed cocktails - and display a banner bearing the venue's temporary name, the Trump Arms.
That will be about the extent of Trump's exposure to London.
I think Donald Trump has ignorant views about Islam.
The 6-metre orange balloon, which shows the president wearing a nappy, will fly near parliament at a height of 30 metres between 9.30am and 11.30am local time.
Taking the London mayor to task for not expressing outrage at what he described as Obama's initial decision to "introduce a total ban on refugees coming from seven predominantly Muslim countries", Farage said the decision to allow the blimp was "a step too far".
Less of a bright spot for Trump, whose mother hailed from Scotland, will be the protestors awaiting him in London.
"No, the president is not avoiding anything". "The president is merely trying to get as impactful a trip as he can get in a 24-hour period".
Continuing the military theme on Friday, the president and Theresa May will watch a demonstration at a defence site to showcase the UK's "cutting edge military capabilities and integrated UK-US military training".
"Prime ministers frequently make use of Chequers for meetings with foreign leaders", she said.
Leo Murray, one of the balloon organizers, wrote in Metro that he and his friends conceived the idea because "to really get through to Trump, you have to get down on his level and talk to him in a language he understands: personal insults".
Next Friday evening, Mr. Trump will depart for Scotland, where Mr. Johnson said he would spend the weekend preparing for the meeting with Mr. Putin. He owns two golf courses there, Trump Aberdeen and Trump Turnberry.
Dawsey reported from Washington.
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